Actually all of the original hull from 1888 is still there. True, it has been plated over since then but if you were to see her from below decks you would see the original pieces brought to lakeport in 1940. As far as the engines go, she was originally powered by steam engines in 1940, but as you mention they were removed for the war effort. She was repowered in '46 with the present Enterprise Diesels that run her twin screws. So she has always been twin screw since 1940 the only change was the engines from steam to diesel.
